Meaning: 1. A mountain range with a jagged line of peaks or ragged profile. 2. A west coast Spanish mackerel.

Notes: Today's word is a beautiful Spanish gift to English that is used in many names by speakers, many of whom are probably unaware of its meaning. Sierra in Spanish originally referred only to the cutting tool, a saw. But the jagged blade of a saw lent its name metaphorically to the jagged ridges of mountains, like the Sierra Nevada, the snow-covered saw, in Spain. (Yes, Nevada means "snow-covered" in Spanish—odd name for a state that shares Death Valley and the Mojave Desert with California, no?)

In Play: The African nation of Sierra Leone, the lion saw, the Sierra National Forest which contains much of the California Sierra Nevada, and the Sierra Club came along after the metaphor had become the second meaning of the word. The same is true of the Sierra Madre mountain range in Mexico, the Mother Range, and the setting of the 1948 Humphrey Bogart classic, The Treasure of the Sierra Madre, directed by John Huston.

Word History:Sierra is the Spanish descendant of Latin serra "saw". The adjective from this word was serratus "like a saw, saw-shaped", which gave English its adjective serrated, referring to knife blades that are toothy, like a saw.